Add FVFunctorDirichletBC

[snschune]

Reason

Use functors to set BCs is required if the information comes from a transfer from a different app.

Design

An FV Dirichlet boundary condition that takes a functor name as parameter and evaluates it to set the boundary
value

Impact

New capability.

Caveat: @GiudGiud @lindsayad FVDirichletBC return only Reals, not ADReals. This is ok for my use case (MultiApp transfers lose derivative info anyway), but in general someone could abuse this.

[GiudGiud]

let's roll without AD for now

[lindsayad]

we could force users to be more conscientious about this by only taking a Real functor, which would necessitate creating a conversion functor material property. This would prevent accidental use of nonlinear variables for example.

I don't have a strong preference on this though

[GiudGiud]

Yeah that seems fine to me too, but AuxVariables are ADFunctors too so that's that.

If we do that change, let's add that conversion story in the documentation for the FunctorDirichletBC

[lindsayad]

If we could at some point make an aux variable inherit from Functor<Real>, that would be nice

[moosebuild]

Job Documentation on 69ac1c1 wanted to post the following:

View the site here

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[moosebuild]

Job Coverage on 69ac1c1 wanted to post the following:

Framework coverage

	41e7a8	#21377 69ac1c
	Total	Total	+/-	New
Rate	83.48%	83.48%	-0.00%	100.00%
Hits	77407	77413	+6	10
Misses	15318	15322	+4	0

Diff coverage report

Full coverage report

Modules coverage

Coverage did not change

Full coverage reports

Reports

• framework
• chemical_reactions
• combined
• contact
• external_petsc_solver
• fluid_properties
• fsi
• functional_expansion_tools
• geochemistry
• heat_conduction
• level_set
• misc
• navier_stokes
• peridynamics
• phase_field
• porous_flow
• ray_tracing
• rdg
• reactor
• richards
• stochastic_tools
• tensor_mechanics
• thermal_hydraulics
• xfem

This comment will be updated on new commits.